#vintageanalogsynth
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piscineatokyo · 7 years ago
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All three PSU rails are finally back on @lafrettestudios 's PM PSU! 😊😊😊 . Diode bridges all replaced, all 'lytics recapped with high grade Vishays, trimmers replaced with cermet ones, shorted transistors replaced with fresh-new TIP42B (with new thermal paste and corresponding mica insulators), one faulty IR22B Zener and two dead LM723H regulators all replaced too!!! . Hopefully this wonderful instrument will eventually work again, one day... ;-) . #Moog #MoogMusicInc #Polymoog #MoogPolymoog #PolymoogSynthesizer #MoogPolymoogSynthesizer #VintageAnalogSynth #AnalogSynthesizer #Repair #PowerSupplyUnitRepair #PSURepair #VintageElectronicsRepair #LaFretteStudios #StudiosLaFrette #StudioPiscineATokyo #PiscineATokyo #TheGoodDoctorPrager
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piscineatokyo · 7 years ago
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Previous tech obviously had confused OB-Xa various revisions: a 74LS139 dual 2-4 line decoder (for rev. 3) had been installed in the original location for a 74LS42 4-10 line BDC to decimal decoder!!! No wonder that the synth couldn't even start-up: the CPU never had access to the software EPROMs... . #Oberheim #TomOberheim #OBXa #OberheimOBXa #AnalogSynthesizer #VintageAnalogSynth #80sSound #Repair #Fix #StudioPiscineATokyo #PiscineATokyo #TheGoodDoctorPrager
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